Flask-centering device for helical ramming machines



J. MONTGOMtHY. .FLASK CENTERING DEVICE FOR HELIQAL RAMMING MACHINES. APPLICATION FILED JUL-Y 9,1921.

1,434,9 0, Patented Nov. 7, 1922.

J. MONTGOMERY.

FLASK CENTERING DEVICE FOR HELICAL RAMMING MACHIN ES APPLICATION FILED JULY 9.1921.

1,434,960, Patented Nov. 7, 1922.

2 SHEET$-SHEET 2.

frzzaenian Jamal b zgomgrjl Patented Nov. 7, 1922.

PATENT OFFICE.

UNITED STATES JAMES MONTGOMERY, 0F SCOTTDALE, PENNSYLVANIA, ASSIGNOR TO UNITED STATES ,CAST IRON PIPE & FOUNDRY COMPANY, OF BURLINGTON, NEW JERSEY, A CORPO- RATION OF NEW JERSEY.

FLASK-CENTERING DEVICE FOR HELICAL RAMMING MACHINES.

Application filed July 9, 1921. Serial No. 483,416.

To all whom it may concern: 9

Be it known that I, JAMES MONTGOMERY, a citizen of the United States of America, and resident of Scottdale, in the county of l/Vestmoreland, in the State of Pennsylvania, have invented a certain new and useful Improvement in F lask-Centering Devices for Helical Hamming Machines, of

which the following is a true and exact description, reference being had to the accompanying drawings, which ,form a part thereof.

My invention relates to helical ramming machines such as are used in making pipe molds.

In machines of this class a series of flasks are supported and carried by a turntable into registry with a depending guide arnr which supports the helical rammer, the rammer being lowered into the flask and sand fed in between the flask and pattern and compacted by the helical rammer which rotates, tamping down the sand under its helical end surface and rising in the flask as sand is fed in. Owing to the helical form of the sand compacting device considerable side thrust is exerted with a tendency to bring the flask out of proper alignment with the rammer and the object of my invention is to provide such amachine with mechanism whereby the top of the flask in which the sand is being compacted shall be gripped to and held in proper.

registry with the frame supporting the ramming mechanism so as to afford sufficient resistance to the sidethrusts and maintain the parts in proper alignment.

The nature of my improvement will be best understood as described in connection with the drawings in which it is illustrated in what I believe to be its best and most effective form and in which Figure 1 is a view showing a portion of the top of the turntable with a flask sup ported thereon in the usual manner, said view showing also a portion of the usual framing for supporting ramming mechanism and showing in connection therewith my improved flask gripping mechanism.

Figure 2 is a front view of the mechanism shown in Fig. 1 with gripping mechanism in operative position shown in full lines and in retracted position shown in dotted lines.

Figure 3 is a View of driving mechanism ported on the flange A of the turntable by a lug indicated at C. B indicates the top of the flask. D indicates a framing supported above the turntable, D indicating the top of this framing. D and Diusual parts of the truss of which the framing is made up. E, E, are angle irons supported on the frame D and making up with proper connecting braces a supporting frame and guideway for the helical frame and rammers. F, F, are iron plates secured to the angles E and to the members D as shown, and F a plate extending between and secured to these plates F, secured on the top D ofthe framing. G is the driving mechanism for giving rotary motion to the helical rammers, as shown, see Fig. 3. The rotating shaft G communicates this motion through the bevels G and G to the shaft G which through a pinionG and a pinion G communicates motion to the shaft G which in turn through the bevels G G, G and G gives rotary motion to the vertical shafts tions J having squared openings J in their tops through which extends the squared shafts H or H. The portions J 2 are formed in the thimbles J and on these thimbles fits a nut J between which and the enlarged portion J is held a ring K having outwardly extending arms K with forked ends K which engage on flanges of the angle nected with counterbalancin g weights not shown and with a portion of the gripping mechanism to be described.

i N, N, are slotted guideplates secured to the bottom of the framing E asindicated in Figsal and 2. O, O, are rock shafts se-w cured in hearings on the plates F, fF. and having in a convenient place for the operator actuating levers O. To these rock shafts are also secured levers O 0 which are pivotally connected at theirellds with gripping jaws P, P, the lower ends of which pass through the guides N, N, as shown. The ends of the levers O are connected with the cables M so that the action of these cables tends to throw the levers up to the positions shown in dotted lines in F i 2.

he size and proportions of the levers 0 the gripping aws P and the, guides N are such that when the gripping jaws are forced downward their ends P will grip and hold the top B of the flask, as shown in Fig. 2, while when elevated these jaws will take the position shown in dotted linesin Fig. 2.

In operation the turntable is rotated to bring a flask into registry with the helical rammer or rammers which, of course, are in their retracted or uppermost positions as indicated in Figs. 1 and 2. The operator then seizes the levers O which are normally in the position shown in dotted lines in Fig. 2 and moves them downward and toward each other to the position shown in full lines in Fig. 2. This motion ofthe levers rotates the rock shaft 0 and the levers O which in turn communicates, motion to the jaws P, P, forcing their upper ends outward and their lower-ends inward as these jaws move down until the ends P of.the jaws engageand clamp the top ofthe flask as shown in 2, grippingthe top the flask firmly to theframe and insuring proper alignment of the flask during the ramming operation. The operator then lowers the helical rammerinto the flask, feeding molding sand intothe top of the flask and the rotation of the helical rammers rams and packs sand into the flask, raising, of course, when the flask is filled with sand until the mold 'is completed after which the rammers are raised to clear the top of the flask, the gripping jaws are retracted, and a new flask brought toregistry with the frame and rammers. 7

Having now described my invention, what I claim as new and desireto secure by Lett r P ent, s=

1. In, a helical pipe mold ramming machine comprising a turntable for supporting and moving the flasks and a depend-v.

ing frame for guiding the helical rammer, means supported on thelower part of said frame for gripping and holding a flask to the depending frame and in proper registry witlrthe rammer.

2. In a helical pipe, mold ramming machine comprising a turntable for supportin and moving the flasksv and a depending frame for guiding the helical rammer, means supported-0n said frame for gripping and holding a flask in proper registry with the rammer, said means consisting, of gripping jaws normally held retracted and extended on the frame and means for moving the downward and together to grip the flask.

3. In helical pipe mold ramming machine comprising a turntable for supporting and moving the flasks and a depending frame for guidinga flask gripping device consisting of guides secured tothe bottom of the frame, gripping jaws the lower portions of which extend through said guides and means, securedto the upper ends of the jaws for moving them down and up to grip and release the top of a flask.

4t. In a. helical pipe mold ramming machine comprising a turntable for supporting and moving the flasks and a depending frame for guidinga flask gripping device consisting ofguidessecured to the bottom of the frame, gripping jaws the lower portions of which exten dthrough said guides. rock shafts havinglever arms secured to the tops of the jaws whereby said jaws are moved down andgup to grip and release the top of a flaskand lever arms secured to the rock shafts for operatin dthem.

JAME MONTGOMERY. 

